body{
  width: 100vw;
  height: 100vh;
  background-color: #e9e7ef;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}
.app{
  width: 40vw;
  padding: 10px;
  background-color: #fefefe;
  border-radius: 10px;
  overflow: auto;
  box-shadow: -6px -6px 16px #fff,5px 5px 10px #888;
}

h1{
  text-align: center;
}